8-th episode of 9-th season "Doctor Who"

What "Doctor Who" 8-th episode about

Shapeshifting Zygons are everywhere in the UK and there is no way of knowing who to trust. With UNIT neutralized only the Doctor stands in their way. What can the Doctor do to save his friends?.

Episode number: 8

Episode name: "The Zygon Inversion (2)"

Episode release date: 7 november 2015 at 20:00

Status: aired